This article is from the Food Preserving FAQ, by Eric Decker firstname.lastname@example.org with numerous contributions by others.
From: Matt Albright
Faster way to chop citrus peels for marmalade
I usually use a vegetable peeler to strip off the zest and then run it
through the food processor. Just a few pulses are necessary. I do not use
the white part in my marmalade because it makes it too bitter and it takes
longer to set (my observation).